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dc.contributor.authorMatabola, Kgabo B.en_US
dc.contributor.authorStrydom, Christien A.en_US
dc.contributor.authorVan der Merwe, Elizabet M.en_US
dc.contributor.authorLabuschagne, Frederick J.W.en_US
dc.date.accessioned2012-02-29T09:51:54Z
dc.date.available2012-02-29T09:51:54Z
dc.date.issued2010en_US
dc.identifier.citationMatabola, K.B. et al. 2010. The influence of hydrating agents on the hydration of industrial magnesium oxide. Journal of chemical technology and biotechnology, 85(12):1569-1574. [http://dx.doi.org/10.1002/jctb.2467]en_US
dc.identifier.issn1097-4660 (Online)en_US
dc.identifier.urihttp://hdl.handle.net/10394/6084
dc.identifier.urihttp://dx.doi.org/10.1002/jctb.2467
dc.description.abstractBACKGROUND: The influence of different hydrating agents on the pH of the hydrating solutions, rate of hydration of MgO to Mg(OH)2 and product surface area was studied as a function of temperature of hydration. Hydrating agents used were aqueous solutions of ammonium chloride, magnesium acetate, magnesium nitrate, nitric acid, acetic acid, magnesium chloride, sodium acetate and hydrochloric acid and distilled water as control. These were chosen to determine either the effect of addition of a common ion, the effect of changing the solution pH or due to the presence of an acetate ion, found earlier to have a beneficial effect on the hydration of MgO. RESULTS: There was no significant difference in the hydration behaviour of the hydrating agents up to 50 °C, where less than 10% of magnesium hydroxide was formed. The amount of hydroxide increased at temperatures above 60 °C. When compared with the hydration in water, all the hydrating agents, with the exception of sodium acetate, showed a significant increase in the degree of hydration. Sodium acetate formed the lowest amount of magnesium hydroxide, ranging between 1.2 and 12.2% magnesium hydroxide. The largest percentage (56.7%) of magnesium hydroxide was formed from hydration in magnesium acetate. CONCLUSION: It seems that MgO hydration is a dissolution-precipitation process controlled by the dissolution of MgO. The increased degree of hydration in magnesium acetate is possibly due to the presence of acetate and Mg2+ ions.
dc.languageen
dc.publisherWileyen_US
dc.subjectMagnesium oxide
dc.subjectHydration
dc.subjectMagnesium acetate
dc.subjectAcetic acid
dc.subjectTemperature and pH
dc.titleThe influence of hydrating agents on the hydration of industrial magnesium oxideen_US
dc.typeArticle
dc.contributor.researchID20682972 - Strydom, Christiena Adriana


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